SYNOPSIS

int intel_logical_ring_begin(struct drm_i915_gem_request * req, int num_dwords);

ARGUMENTS

req

The request to start some new work for

num_dwords

number of DWORDs that we plan to write to the ringbuffer.

DESCRIPTION

The ringbuffer might not be ready to accept the commands right away (maybe it needs to be wrapped, or wait a bit for the tail to be updated). This function takes care of that and also preallocates a request (every workload submission is still mediated through requests, same as it did with legacy ringbuffer submission).

RETURN

non-zero if the ringbuffer is not ready to be written to.

AUTHORS

Jesse Barnes <[email protected]>
Intel Corporation,         
        

Initial version

Laurent Pinchart <[email protected]>
Ideas on board SPRL,         
        

Driver internals

Daniel Vetter <[email protected]>
Intel Corporation,         
        

Contributions all over the place

Lukas Wunner <[email protected]>

vga_switcheroo documentation

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